Please help. Just in case the picture isn't showing A proportional relationship is graphed on a coordinate plane. The point (4, 10) is on the graphed line. Lynn said, " If x = 4 and y = 10, then the constant of proportionality is 6 ". Lynn's claim is not true If x = 4 and y = 10, what is the constant of proportionality?

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?