How do you solve:
5x+6y=15
y=-4x-7
by the substitution method

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9

What is the equation of a line passing through (-6,5) and having a slope of 1/3

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of