Define number a so that the straight that goes through points (-1,3) and (3,a). the straights slope is 2:3
+130516 Define number a so that the straight that goes through points (-1,3) and (3,a). the straights slope is 2:3
So we have
[3 - a] / [-1 -3 ] = 2/3
[3 -a ] / -4 = 2/3 cross-multiply
3(3 -a) = -8 simplify
9 - 3a = -8 subtract 9 from both sides
-3a = -17 divide both sides by -3
a = 17/3
+130516 Define number a so that the straight that goes through points (-1,3) and (3,a). the straights slope is 2:3
So we have
[3 - a] / [-1 -3 ] = 2/3
[3 -a ] / -4 = 2/3 cross-multiply
3(3 -a) = -8 simplify
9 - 3a = -8 subtract 9 from both sides
-3a = -17 divide both sides by -3
a = 17/3
